US3428133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Land leveler
Assignee: CHARLES F LEONARD
•
Filing: 1965-08-18
•
Granted: 1969-02-18
•
Expires: 1985-08-18
Abstract
No abstract record available.
Inventors
- 👤 Thomas J Young
- 👤 Charles F Leonard
- 👤 Claude H Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:05
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/7663; E02F3/7668; E02F9/00; E02F9/02; E02F9/024
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US924966A
Cited
US1340497A
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US2282752A
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US2266625A
Cited
US2719369A
Cited
US2792651A
Cited
US2842874A
Cited
US2881541A
Cited
US3080666A
Cited
US3353288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |